The Galileo uses one of the most reliable methods of analyzing body composition, BIA, short for bioelectrical impedance analysis. BIA is based on a persons height, weight and the strength and speed at which a very safe, low-level electrical signal passes through the muscle and fat in the body. The Galileo 2 uses a true BIA process that is accurate, convenient and fast. Electrodes built into the medal Foot Pads sends a safe electronic signal through the body. Weight and body fat are calculated automatically.